Blade sharpening device



NOV, 23, 193.7. G BARSCH 2,099,791

BLADE SHARPENING DEVICE Fivled Feb. 8, 1956 2 Sheets-She-et lNov.23,1937. G, BARSCH 2,099,791

` BLADE SHARPENING DEVICE v Filed Feb. 8, 1936 2 Sheets-Sheet 2 PatentedNov. 23, 1937 UNITED STATES 'PATENT OFFICE BLADE SHARPENING -DEVICEGuillaume Barsch, Paris, France, assigner to Industrie A. G. Allegro,Emmelibrucke, Switzerland 3 Claims.

'Ihe present invention relates to a blade sharpening device and, moreparticularly, to a device for sharpening the blades of scissors.

The principal object of the invention is to pro- 5 Vide a bladesharpening device for use with scissors which will permit scissors to beefliciently sharpened without taking the blades apart and which isreadily adaptable for use with scissors of different sizes. As will beapparent from the l following specification, the use of the device isnot conned to scissors, since it may be used for sharpening blades ofvarious other types.

Other objects and advantages of the invention will be apparent from thefollowing drawings and l specification wherein,

Figure l is a side elevation of the device with a portion of the basebroken away;

Figure 2 is a plan view of the device with portions removed;

Figure 3 is a side elevation of a grinding element holder used in thedevice;

Figure 4 is a detail perspective view of a portion of the supportingmeans;

Figure 5 is a detail view of a part of the device;

Figure 6 is a fragmentary View showing a modied form of supportingdevice;

Figure '7 is a side elevation of a modified form of grinding element;and

Figure 8 is a side elevation, with portions broken away, of a modifiedform of the device.

Referring to Figures 1 to 5, the base of the device, preferably formedof wood, is designated by the numeral I and has a central cutout portionextending through one end of the base, the

cutout portion being indicated by the numeral I4. Upon the upper surfaceof the base I, there is fixed a grinding element holder 2 in which issecured a stationary grinding element 3. 'Ihe holder 2 and element 3 arepositioned adjacent the inner end of the cutout portion I4 and arebifurcated as shown in Figure 2 so that portions of the grinding element3 Will extend about the sides of the upper portion of the cutout portionI4.

A bracket 8 is secured to the upper side of the base I, which bracketpivotally supports a second grinding element holder 'I in which issecured a grinding element 5 having a concave grinding face 5. The upperend of the holder 1 is supported in the upper end of the bracket 8 bymeans of a U-shaped resilient member Il having inwardly projecting armsI0 arranged to be positioned in any one of a series of vertically spacedapertures 9 in the bracket the arms l!) then projecting into the eye I2formed at the upper end of the holder 'I. The lower end of the holder 1has .secured thereto one end of a coil `spring I3 arranged in the cutoutportion I4, the other end of the .spring being secured to the base I.

It will be observed that by the above arrange- 5 ment, the grindingelement 5 may swing outwardly with respect to the grinding element 3 butwill be tended to the position shown in Figure l. The provision of ythevertically spaced apertures 9 -in the bracket 8 will .permit thegrinding ele- 10 ment 5 to be raised or lowered relative to the.grinding element 3 to operate upon blades of different angles ofcutting edges. Both the grinding elements 3 and 5 may be removable fromtheir respective holders. l

In the use of the device, described above, a pair of scissors may beopened as illustrated in Figure 2 and one blade positioned with its flatsurface bearing upon the grinding element 3. The scissors may then bemoved in an orbital path as 20 designated by the line I6 in Figure 2, orin a zigzag path as indicated by the line I1. In either event, thegrinding element 5 will be swung relative to the grinding element 3 toact upon the cutting edge of the blade, but the concavity of 25 thegrinding face of the element 5 will result in the same angular relationbetween the two grinding elements, regardless of the swinging movementof element 5.

Figure 6 shows a modied form of securing 30 element used to support agrinding element 6a in the bracket 8, this securing element beingdesignated by the numeral Ila and including a single arm Illa extendingentirely through the upper end of the bracketv 8. This form of hold- 35ing means is particularly adapted for use with a grinding element holder1' having a narrow eyelet I2a at its upper end and, by this arrangement,the holder and the grinding element carried thereby may have a certaindegree of lateral 40 movement.

The grinding element 5 described above is of such length that only oneend thereof will be exposed to Wear and when this end becomes worn, theelement may be reversed in its holder. 45

Figure 7 shows a grinding element 5a which is of but half the length ofthe element 5 and which will of course be entirely satisfactory,although it is not reversible.

Figure 8 shows a modied form of the device 50 which is of identicalconstruction with the form disclosed in the gures heretofore discussedexcept that the movable grinding element holder Ia corresponding to thepreviously discussed holder 'l is supported in a bracket 8a secured 55"to one end of the base I andthe spring I3 is connected to the holder laintermediate its ends.

The grinding element 5b carried by the holder 1a has a convex grindingsurface 6', this form of grinding surface being necessary because of thepoint at which the holder 1a is supported. The holder 1a is adjustablein thebracket 8a by means of the spring element IlV arranged to be ttedin vertically spaced apertures 9 in the same manner as has beendescribed above in conl nection with Figures l to 5. The operation ofthe Figure 8 device is identical with vthat of the device disclosed inFigures 1 to 5.

In both forms of my invention the movement Y ofthe blade on the stonesin an orbital or zigzag path as already referred to, produces along theedge of the blade a diagonal grindingrmotion which has the mosteffective sharpening action with the advantage that the sharpening takesplace along constantly changing generating lines of the sharpeningsurfaces. Also,y 'when the device is used for sharpening scissors,it i'snot necessary to ldisconnect the blades. 'I

It will also be noted that the invention isof such design that noconsiderable degree -of skill is necessary to obtain a properlysharpened blade. Y

I claim: Y

1. A blade sharpening device comprisingI an element having a iiatgrinding surface, an 'element having a curved grinding surface, saidYcurved surface element being pivotally mounted for bodily swingingmovement longitudinally of the grinding surface of said other element,and means to tend said curve-surfacedrelement to a predeterminedposition with respect to said flatsurfaced element.

2. A blade sharpening device comprising an element having a at grindingsurface, an element having a curved grinding surface, said curvedsurface element being pivotally mounted element will have the samecurvical relation to Ying movement longitudinally `of said other elementand in said recess, and means to tend said movably grinding elementtothe inner portion of the recess in said kfixed element.

GUILLAUME BARSCH.

